This is my first SCP and I would appreciate any feedback or criticism. Please don't troll.
If someone could tell me how, or direct me to a resource that tells how to put the small box under pictures containing information, I would be very grateful. Thanks!

0) You don't have to sign your posts. Your name is right there. We can see who you are.

1) Those are grapes. (Or at the very least look like them. Whatever they are, they aren't apples.)

2) All flora must be the original species of their genus - What.

3) The description is a single paragraph. Never a good sign. Your major issue here is with the "non-genetically engineered plants", because in the broad sense of the term all domesticated crops have been genetically engineered through selective breeding.

4) No need for a test log that big. We know what the thing does, we don't need more to bloat the article.

5) “Goldberries. They are not blue, they are gold, and deserve to be addressed as such.” - Yeah, this is really silly.

Thanks for the feedback! It was very useful.
also, I know those are grapes. If you read into the article, it is shown that there are gold grapes produced, yet no apples. I just had not figured how to label the picture yet.

Here is where you'll find the template for an image+text, under the "Templates" tab.

I actually kinda like your basic concept, here— it's hard to do a mythic SCP well, but I like the direction you've taken it. The draft needs some substantial work where style, science, and the actual effect are concerned, though. For one, I think a little lightheartedness can have a place in an article, but you edge too close to informal tone in quite a few places.

Your botany is also rather jumbled, I'm not quite sure what you're trying to say, in a few places:

All flora must be the original species of their genus.

SCP-869-02 can be absorbed and used by any plant that has not been genetically engineered. If not absorbed within two hours of creation, SCP-869-02 will turn acidic.

Are you sure about the viability of your time frame, there? I'm not a specialist, so I don't know. It leaves me wondering how this was tested, too; how was the effect discovered?

SCP-869-03 is a rare event. While most flora will grow at an accelerated rate (see testing log), plants that can produce fruit or vegetables have a chance to bear “golden fruit”

I actually like this idea, but you've phrased it messily.

And a big issue— why are RESEARCHERS and STAFF eating this stuff? No way they should be describing it before ample and long-term testing on D-class.

Thanks for the feedback, Cellar. One question: in "SCP-869-03 is a rare event.", should it be phrased "anomalous event", or is it too regular for that? I've also made some corrections, if you have the time. Have a nice day~

That said, I reserve pleasantries for people who do their due diligence. This includes reading and abiding by the rules, as well as reading a significant portion of the site and understanding the site culture before contributing. I also don't think very highly of people who imply that we are a bunch of trolls before anyone has even so much as talked to you yet. You're not off to a great start so far.